Restriction valve



Patented Feb. is, 1924.

-iU-mEes1-mes FRANK B. 00mins, or NEWTON, nun JOSEPHLJ-ABMYSTBONQQ0F.-;1VIALDE1\T, -;1vrAss A'- 'cnusnrrs, ASSIGNORS 'ro AMERICANr/rors'rnmndGQMrANY, or :BosroN, MASSA-" cnusnr'rs, A con'ronnrrouorMarne.

iansrniorron VALVE.

Application filed. Ma 28,

To allwhom it may concern:

Be it known that we, FRANKBQGOMINSQ and J OSEPH ARMSTRONG, citizens ofthe United States, residing at Newton and Maiden, respectively, in thecounty of Middleser: and State of Massachusetts, have inventedcertainnew and useful Improvements in Restriction Valves, of whichfthefollowing is a specification.

This invention relates to improvements in restriction valves. Moreparticularly it relates to devices by which a passagemay'be provided fora desired minute flow of fluid such as compressed air from a source ofsupply, the passage being, for example under one one-hundredth of aninch in diameter. clogged by solids carried by the fluid, in spite ofall filtering precautions which may be taken; and the parts involved areso delicats in dimension, and relatively weak in consequence that theattention of aneXpert is required usually to adjust Land, maintain themin satisfactory, working .order I The present invention has beende'vis'edto improve that form of apparatus .of this, type =which lisusedincon'nection with automatic control, apparatus; for operating' a relayvalve which, by apparatus not w necessary to beYdesc ribed here, isarranged to be actuated by the'saine supply of fluid energy-in this casecompressed air'which furnishes thestream of fluid that is topass throughthe restriction valve. The term, restriction valve is used,herein'because it is a term known in thet'rade, although it is amisnomer to a degree, the function is not that of a valve, to open andclose a passage, but rather is merely that of arestricting element tofix the size of a passage. On account of the danger of clogging, it isdesirable to have this. element removable for cleaning purposes.Heretofore, in one arrangement on which the present invention is animprovement, a tapering pin has been used, having a diameter rangingfronrfive hundredths of'an inch downward, and having a scratch in itssurface constituting the passage for such restricted flow of air as.

is desired. In the handling of such pins, when installed in apparatus onthe premises of users in factories and elsewhere, it is found that theworkman who removesthe pin for cleaning purposes, is liable to driveSuch passages are liable to become 1921. a e; u f 475,331.

it in too far, it', thereafter;hav

ing' r b eii zgtt gl t o t aga n for ch ir, 7

o eoau el'of. i ze; e. l ab e to lose it. The present improvementprovides a pin havingdeterminatejlimit .of ins rmo Gamb e. offlbinglhlelija i limi y a sc th ea th pi "strik g the l m t as a bu mentfrath t a.a a Wed and, therefore, .CQming awaylfrfleelyf without F s i i g pobeing unscre ed re.- stricted peS fig is constituted providing groove orscratch of the' de'siredf depth in the head offlthefpin whichi'bearsagainst the abutment that stops its insertion. j V Theinvention may beapplied in'various forms, a typical one of which is illustrated 111 theaccompanying drawings; but hit should be understood that thef'patentisnot llmlted to the arrangement herein described;

It is intended to cover. by suitable expression in the appended claimswhatever .features of patentable novelty exist'in the inventiondisclosed. v7 1" j c In the accompanying drawings; I

Y Figural illustrates an embodirn nventi 'vh irm 'y be s dered to b aside elevation, bf a medialj section, greatly en f f' p" -summ g; me nsrem rse;

'lfigure' d'is aplan' fthevalvecasingiwith ejval el mbr d;,

the same.

Referring to the drawings, 10 indicates a portion of a passage for afluid whose flow is to be restricted. In the case represented thispassage may be assumed to be a piece of small copper tubing 11 set'intoa block 12 in which is a passage 101 in continuation of the passage 10leading to a central chamber 13 formed by drilling axially through theblock. This chamber may be filled with suitable fibrous material 26adapted to retain any solid matter through the passage 10. ;A plug 27 atthe bottom of the cavity 13 may be readily removed to permit renewal orcleaning of the filtering material. At its other end, the cavity opensinto a larger cavity or hole 14,

entering the chamber. I

which is formed in the block 12 on the same axis as the chamber 13. Thishole may be filled with the entering end of the valve casing 15, makingsuch a tight fit when pressed therein as to be held securely in'place byfriction. Thiscasing has an axial chamber 16 with an inlet 17 throughthe middle of its conical bottom communicating with the chamber 18, andan opening 18 in its side' adapted to register with a passage 18"through the block 12, to constitute a discharge passage from the chamber16; there being a piece of copper tubing 20, arranged in the blocksimilar to the tubing" 11 for carrying restricted flow of fluid. Therestriction is effected by means of a valve whose face 21 is adapted toseat on the chamber bot:

tom to close the greater part of the inlet 17,

whose threaded top portion 28 is screwed into the outer end of thecasing by aid of its knurled head 24.

The hemispherical face of the valve makes only a line contact with theconical surface of the seat, and this is a marked improvement over thesurface contact of the hereinbefore mentioned tapering pin type ofvalve.

i In the latter, the restricted passage is necessarily ofappreciable'length, difficult to make accurate, and easily clogged whenin use since any solld matter, however small, entering the restrictedpassage mustlnaturally strike against vthe walls thereof, and be slowedup by the frictional resistance of such engagement, whichif repeated.asfoften o as occurs during the length of travel along the relativelyrough surface of a tapering pin must finally stop such a small particle,

and therebby in time clog the passage. With the improved line contact ofthe present invention no length of restricted passage is created,because the abutments are incontact around a horizontal circle, at'somepoint of which a notch is cut for theopening past the otherwise sealedabutmentfsyand any minute particle flowing alongwith the airreadilypasses through the notched opening in the line of contact; and will beblown through if it has tendency to lodge there, reaching space of freerdimensions as soon as it has passed what would be merely theen trance ina restricted passage. 7

After being seated the valve is protected by covering the valve headwith acap 28 fastened externally to the valve casing. The arms 29 andnut 30 represent any suitable fastening ,means for holding the apparatusin position.

When in operation, air flows through the passage 101 from the supplytube 11 into the filtering chamber 13, thence through the inlet 1'?along the scratch 25 on the valve face to the valve chamber 16 fromwhichit dis;

charges through the opening 18 and passage 18 into the tube 20 alongwhich it continues to the mechanism to We clalm: The combination, in afluid passage, of a be operated by it.

filtering chamber; a cylindrical valve chain her with axial openings oneof which con-' stitutes the entrance from the filtering chamher, andwith a lateral dischargeopening; a valve inthe valve chamber,comprisingra stem having at one end a surface adapted to close abruptlythe said entrance except for a channel continuously permittingrestricted flow, "and having f at its other end means 'removablyengaging the sides of the valve chamberyadapted both, to close the otheraxial opening and'to' support the stem.

Signed at Boston, Massachusetts, this 23rd l day of May, 1921, r f t a aFRANK B. GOMINS. a

JOSEPH ARMSTRONG," I

